Ferrous alloy



Patented Not. 11, 1930 J .'BYRAl![JI D. SAKLATWALLA, OF GRAFTON,PENNSYLVANIA i l r J No Drawing.

4 This invention relates to ferrous alloys and particularly to a ferrousalloy containing copper, silicon and'aluminum. The copper and siliconimpart to ferrous metal corrosion 5 resisting'properties in a highdegree and -to gether with chromium these elements have been utilized toproduce some of the corrosion resisting steels such as described in theapplicants Patent No. 1,676,929 of July 10,

1928. For certain purposes, however, especially for resistance toscaling at high temperatures, expensive chromium can be elimi nated andreplaced by comparatively small percentages of aluminum.

According to the present invention, by the addition of-about 0.1% to2.00% aluminum to alloy steels or irons containing copper and silicon ithas been found that steels or irons showing remarkable resistance toscaling and corrosion at high temperatures can be produced. By varyingthe copper content in suchsteels from 0.5% to 5.00% and the siliconcontent from 0.5% to 6.00% a series of alloys can be produced withvarying'de'grees of non-corrosive properties at high temperatures. Suchalloys can be produced with very low carbon contents but for thephysical re- 'quirements of strength the usual carbon per-- centagesoccurring in steel, namely from 0.1% to about 2.00% can be utilized Suchsteels can be fabricated by the usual steel making processes, obtainingmaterial of sound physical charactertistics and great degree ofductility. Such material can be forged into bars, rolled into sheets,etc. Such alloys can further be improved as to their physicalcharacteristics by the proper heat treatment. Such materials canbeobtained in the annealed condition or can be improved by the processesof quenching and drawing back, thus furnishing a very wide latitude ofmaterials with different physical properties.

Besides the rolled and forged materials, cast materials ofthiscomposition resisting the action of high temperature can be obtainedby allowing the carbon content to in crease up to about 3.5%. Such castmaterials can also be subjected to annealing or other heat treatingprocesses whereby their FERBOUS ALLOY Application fil ed October 29,1927. Serial 1W0. 229,792.

physical characteristics can be markedly im-' proved.

Materials of this composition with the suitable carbon range are,therefore, very well adapted to the manufacture of internal com- 65bustion engine valves, carburizing boxes, electrical resistance'heatingelements,'tools and .rolls operating at high temperature and for otherpurposes where a metal is desired to reresist scallng at a high degreeof heat. Such materials are especially remarkable for retaining theirphysical strength at elevated temperatures.

'- action from combustion gases, etc. is important a high copper contentup to the upper 5 limit of 5.00% is advantageous.

.The various steels and irons according to this invention showing theproperties above described can be produced by variation of the contentsof silicon, copper and aluminum with the following limits:

Copper from 0.5% to 5.00%.

Silicon from 0.5% to 6.00%.

Aluminum from 0.1% to 2.00%.

In the above described ranges the carbon content can be either that ofthe steel range, namely; from 0.1% to 2.00%, or in the cast iron rangesfrom 2.00% to 3.50%. Also in the above described alloys no reference ismade to the presence of other elements, such as manganese, sulphur,phosphorus, etc., always present in steels and cast irons as theirpresence to the usual extent does not interfere with the properties ofthe above described ferrous alloys. Further, any refining agents oralloys such as titanium, vanadium,

' zlrconium, etc.,. added to these compositions tothe extent as isordinarily done in alloy steels does not change the characteristicproperties of these ferrous alloys-y The present invention is notlimited to the exact proportions set forth, as its1preferred embodiment,but may be otherwise embodied within the scope ofthe following claims.

I claim: 1. A ferrous alloy containing from 0.5% to 5.0% copper, from-0.5% to 6.00% silicon, and from 0.1% to 2.00% aluminum, together withcarbon within the range of cast iron, and characterized by itsresistance to scaling and corrosion at high temperatures. 2. A cast ironalloy contalning from 0.5%

to 5.0%copper, from 0.5% to 6.00% silicon,

' and from 0.1% to 2.00%; aluminum, to-

gether withcarbon from 2.0% to 3.5%, and characterized by its resistanceto scaling and corrosion at high temperatures.

- In testimony whereof I have hereunto set Q my hand.

. BYRAMJI D. SAKLATWALLA.

